standard specification for fabrication and erection of piping

Owner is entitled to send his own inspector, to field or shops where pre-fabrication and erection of
pipe lines are being done, with the following functions but not limited to :
i) To check that the welding performance and welding equipments used on the job are suitable and
conform to relevant standards.
ii) To supervise welding procedure qualification.
iii) To supervise welder performance qualification.
iv) To check whether welding is conforming to relevant specification and the practice
construction practice.
To check any other performance to ensure quality of work.
Contractor shall notify sufficiently in advance the commencement of qualification tests, welding
work and acceptance tests, to enable the Owner’s Inspector to supervise the same.
Contractor shall provide the Owner’s Inspector with all facilities necessary for carrying out his
work at no extra cot to the owner.
Approval from the Owner’s Inspector shall not relieve the contractor partially or fully of his
responsibilities and guarantees under this contract.
Visual Inspection
Inspection of all welds shall be carried out as per ANSI B 31.3. Finished welds shall be visually
inspected for parallel and axial misalignment of the work, cracks, inadequate penetration, un
repaired burn-through, dimensions, and other surface defects, and it shall present a neat workman
like appearance. Under cutting adjacent to the final bead on the outside of the pipe shall not
exceed 0.8 mm in depth of 12 ½% of the pipe wall thickness, which ever is smaller and the
cumulative length shall not be more than 50 mm in any continuous 300 mm length of weld.
Repairs or removal of defects
Defects which are not within the acceptable limits shall be removed from the joint completely by
chipping or grinding.
When the whole joint is found unacceptable, the weld and the ends of the joints shall be restored
according to relevant clauses under fabrication.
No repair shall be carried out without prior authorization of the Engineer in charge.
9.0 TESTING
General
The field test pressure shall not be less than the greatest of the following:
a) 1 ½ times the maximum sustained operating pressure.
b) 1 ½ times the maximum pipeline static pressure and
Sum of the maximum sustained operating pressure or the maximum pipe line static pressure and
the maximum calculated surge pressure.